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[Here]( en.wikipedia.org/wiki/Registry_fix ) is a good article concerning registry cleaners. While reading this, it warned to be careful using these cleaners as they can get rid of the trojans on your registry but also can delete certain data that is important to your system.
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Christopher ChippsJan 16 '12 at 6:02

Please when you post your question, try to write details about your system and details about how trojan came into your system. So that it would be easy to rectify the problem.
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FrozenKingJan 16 '12 at 6:05

FrozenKing I said it's a windows XP and I got the trojan by opening infected executable. This is all I guess. Formatting is not an option.
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DokkatJan 16 '12 at 6:47

"hijack this" & "Autoruns" are 2 possible tools you could use to disable startup items, and other various things that run at boot/log-in. used in conjuction with other tools.
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PsycogeekJan 16 '12 at 11:54

5 Answers
5

Currently by far and a way my first choice for virus/malware protection on non-commercial Windows machines. Very low footprint compared it its competitiors, integrates with Windows (Firewall, Defender, Updates, etc), multiple definition updates a week (daily?) and it has the same detection rates as the 3rd party tools.
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TurixJan 25 '12 at 15:44

hi you can use Kaspersky Poratable Edition, as you can run without installing it. it will help you, as some of the trojans will block installed antivirus program to run. so this portable version will help you to remove your trojan.

I'd use the latest Restore Point (the one before you ran that trojan) -- type in System Restore in search to see all your restore points. (Back up important files if your restore point is too far in the past.) When everything is restored, I'd download Malwarebytes Anti-Malware, boot in a safe mode and run the whole system scan with it. You don't really need any other anti-virus programs...